It also depends on how fast they want to start walking on it. If the place is empty for you to clean and dry at least a day then hwe is a good method. DFC 105 wool safe, and if the carpet looks bad to begin with then add pro's choice natural fiber rinse to your rinse. less psi and hole
glide recommended. If it's all hallways then bring fans, wool absorbs a lot.
If the place is busy and as soon as you leave they are booking rooms/traffic begins, then encap would be good Crystal Dry Extra by Whittaker is woolsafe approved. I would watch out using a rotary, they will leave the swirls and they might be hard to get out.